Registration Examination for Dietitians (RD/RDN Exam) — Questions and Answers

Question 1: What is the primary fuel source for moderate-intensity aerobic exercise lasting longer than 20 minutes?

Fat (Correct answer)
Alcohol
Protein
Carbohydrates

Correct answer: Fat

After the first 20 minutes of moderate aerobic exercise, fat becomes the dominant fuel source as glycogen stores deplete.

Question 2: Which macronutrient has the highest thermic effect of food (TEF)?

Carbohydrates
Protein (Correct answer)
Fat
Alcohol

Correct answer: Protein

Protein has the highest thermic effect, requiring 20–30% of its caloric value just for digestion and metabolism.

Question 3: What stage of the South Beach Diet results in the greatest weight loss?

Phase Three
Phase Four
Phase Two
Phase One (Correct answer)

Correct answer: Phase One

Phase One of the South Beach Diet is designed to be the most restrictive, eliminating most carbohydrates and sugars to rapidly reduce cravings and initiate significant weight loss. This initial phase typically yields the quickest and most substantial weight reduction.

Question 4: What is the recommended minimum protein intake per pound of body weight to preserve muscle mass during weight loss?

0.2 grams per pound
0.4 grams per pound
1.5–2.0 grams per pound
0.7–1.0 grams per pound (Correct answer)

Correct answer: 0.7–1.0 grams per pound

Most research supports consuming 0.7–1.0 grams of protein per pound of body weight during a calorie deficit to minimize muscle loss.

Question 5: Sodium loss through sweat during prolonged exercise can lead to a condition called what?

Hyponatremia (Correct answer)
Hypoglycemia
Hypernatremia
Hypertension

Correct answer: Hyponatremia

Hyponatremia (low blood sodium) can result from heavy sweating combined with drinking large volumes of plain water without sodium replacement.

Question 6: What is 'Eat Stop Eat' as an intermittent fasting protocol?

Fasting for 24 hours once or twice per week (Correct answer)
Eating one meal per day
Fasting for 12 hours daily
Alternating between eating and fasting every other day

Correct answer: Fasting for 24 hours once or twice per week

Eat Stop Eat involves doing one or two 24-hour fasts per week, with normal eating on the non-fasting days.

Question 7: What macronutrient should NOT be eliminated for sustainable weight loss according to most nutrition guidelines?

Fat
Protein
No macronutrient should be eliminated (Correct answer)
Carbohydrates

Correct answer: No macronutrient should be eliminated

Most nutrition guidelines recommend reducing but not eliminating any macronutrient for sustainable weight loss, as balance supports long-term adherence and health.

Question 8: Which type of carbohydrate is digested most slowly and helps regulate blood sugar?

Refined grains
High-fructose corn syrup
Complex carbohydrates (Correct answer)
Simple sugars

Correct answer: Complex carbohydrates

Complex carbohydrates contain long chains of glucose that digest slowly, providing sustained energy and stabilizing blood sugar.

Question 9: Which outcome is NOT a commonly reported benefit of following the South Beach Diet correctly?

Improved cholesterol levels
Complete elimination of the need for exercise (Correct answer)
Steady and sustainable weight loss after Phase 1
Reduced cravings for sugary foods

Correct answer: Complete elimination of the need for exercise

The South Beach Diet promotes healthy eating patterns but does not claim to eliminate the benefits of exercise; physical activity is still encouraged for overall health.

Question 10: Which of the following sweeteners is generally considered keto-friendly?

Stevia (Correct answer)
High-fructose corn syrup
Table sugar
Honey

Correct answer: Stevia

Stevia is a zero-calorie, zero-carb natural sweetener that does not raise blood sugar and is considered keto-friendly.

Question 11: An athlete training twice per day should prioritize which recovery nutrition strategy between sessions?

Carbohydrate-rich snack within 30 minutes (Correct answer)
High-fiber vegetables only
High-fat meal to replenish energy
A full 3-hour fast to allow muscle repair

Correct answer: Carbohydrate-rich snack within 30 minutes

Consuming carbohydrates within 30 minutes post-session rapidly restores glycogen, enabling adequate energy for the second training bout.

Question 12: What does the '5:2' intermittent fasting protocol involve?

Eating normally 5 days and restricting to ~500 calories on 2 non-consecutive days (Correct answer)
5 meals on 2 days per week
5 hours eating, 2 hours fasting daily
Fasting 5 days and eating 2 days per week

Correct answer: Eating normally 5 days and restricting to ~500 calories on 2 non-consecutive days

The 5:2 protocol involves eating normally for 5 days per week and significantly reducing calorie intake to around 500–600 calories on 2 non-consecutive days.

Question 13: In the list below, which item is NOT a dairy product?

Fromage frais
Yogurt
Veal (Correct answer)
Milk

Correct answer: Veal

Veal is meat from a calf, making it a meat product, not a dairy product. Dairy products are derived from the milk of mammals, such as cows, and include items like yogurt, milk, and fromage frais (a type of fresh cheese). These products are distinct from animal flesh.

Question 14: What is 'autophagy' and how does it relate to intermittent fasting?

A type of insulin response
A form of muscle anabolism triggered by eating
A cellular self-cleaning process stimulated by fasting (Correct answer)
A digestive enzyme released during eating

Correct answer: A cellular self-cleaning process stimulated by fasting

Autophagy is the body's cellular self-cleaning process where damaged proteins and organelles are recycled, and it is stimulated by fasting periods.

Question 15: A whole-food plant-based diet (WFPB) emphasizes which types of foods?

Plant-based supplements and powders
Processed vegan foods and plant-based meats
Raw foods only with no cooking
Unprocessed or minimally processed plant foods like vegetables, fruits, legumes, and whole grains (Correct answer)

Correct answer: Unprocessed or minimally processed plant foods like vegetables, fruits, legumes, and whole grains

A whole-food plant-based diet emphasizes minimally processed plants — vegetables, fruits, whole grains, legumes, nuts, and seeds — over processed substitutes.

Question 16: A marathon runner 'hitting the wall' around mile 20 is primarily experiencing what physiological event?

Dehydration causing muscle cramps
Complete depletion of liver and muscle glycogen stores (Correct answer)
Protein breakdown reaching a critical threshold
Blood pressure dropping dangerously low

Correct answer: Complete depletion of liver and muscle glycogen stores

Glycogen depletion forces the body to rely almost entirely on fat for fuel, which cannot sustain race pace, causing the dramatic slowdown known as 'hitting the wall.'

Question 17: What is the primary benefit of eating a variety of colorful fruits and vegetables?

More protein per serving
Higher caloric intake
Wider range of phytonutrients and vitamins (Correct answer)
Reduced fiber intake

Correct answer: Wider range of phytonutrients and vitamins

Different colors in fruits and vegetables indicate different phytonutrients and vitamins, so variety ensures a broader spectrum of nutrients.

Question 18: Which vitamin is uniquely found in animal foods and not naturally present in plant foods?

Vitamin B12 (Correct answer)
Folate
Vitamin C
Vitamin K

Correct answer: Vitamin B12

Vitamin B12 is naturally found only in animal-derived foods, making supplementation important for vegans.

Question 19: Which nutrient timing strategy has been shown to support muscle protein synthesis throughout the day?

Distributing 20–40 g of protein evenly across 3–5 meals throughout the day (Correct answer)
Eating protein only immediately pre-workout
Avoiding protein before noon
Consuming all daily protein in one large evening meal

Correct answer: Distributing 20–40 g of protein evenly across 3–5 meals throughout the day

Distributing protein intake evenly across meals maximizes muscle protein synthesis signaling because each serving stimulates anabolic pathways that a single large dose cannot sustain all day.

Question 20: What is the typical daily carbohydrate limit to maintain ketosis?

20–50 grams (Correct answer)
75–100 grams
50–75 grams
100–150 grams

Correct answer: 20–50 grams

Most ketogenic protocols restrict net carbohydrates to 20–50 grams per day to keep the body in ketosis.

Question 21: Which type of exercise is most effective for improving insulin sensitivity?

Combined aerobic and resistance training (Correct answer)
Stretching and yoga only
High-intensity sprinting only
Low-intensity walking under 15 minutes

Correct answer: Combined aerobic and resistance training

A combination of aerobic and resistance exercise produces the greatest improvements in insulin sensitivity by targeting multiple glucose-uptake pathways.

Question 22: Which symptom is commonly associated with the initial transition to a ketogenic diet?

Keto flu (Correct answer)
Hyperthyroidism
Hyperglycemia
Iron deficiency anemia

Correct answer: Keto flu

The 'keto flu' is a common set of symptoms (fatigue, headache, irritability) experienced during the first days of starting a ketogenic diet.

Question 23: What does the term 'net carbs' mean in the context of the keto diet?

Total carbs minus fat
Carbs absorbed per hour
Total carbs minus fiber and sugar alcohols (Correct answer)
Total calories from carbs

Correct answer: Total carbs minus fiber and sugar alcohols

Net carbs are calculated by subtracting fiber and sugar alcohols from total carbohydrates, as these minimally impact blood sugar.

Question 24: Which nutrient found in plants inhibits iron and zinc absorption and must be considered in plant-based diets?

Polyphenols
Phytates (phytic acid) (Correct answer)
Fiber
Carotenoids

Correct answer: Phytates (phytic acid)

Phytates (phytic acid) in grains, legumes, and seeds bind to minerals like iron and zinc, reducing their absorption in the gut.

Question 25: What distinguishes 'good carbs' from 'bad carbs' according to the South Beach Diet framework?

Good carbs come only from animal products
Good carbs have more calories; bad carbs have fewer
Bad carbs are those that contain any fiber
Good carbs are digested slowly with minimal blood sugar impact; bad carbs spike glucose rapidly (Correct answer)

Correct answer: Good carbs are digested slowly with minimal blood sugar impact; bad carbs spike glucose rapidly

Good carbs (whole grains, vegetables, legumes) are digested slowly, providing steady energy, while bad carbs (refined sugars, white flour) cause rapid blood sugar spikes.

Question 26: Which food group forms the base of the Mediterranean diet pyramid?

Whole grains, legumes, and plant foods (Correct answer)
Dairy
Meat
Fruits and vegetables

Correct answer: Whole grains, legumes, and plant foods

The base of the Mediterranean diet pyramid consists of whole grains, legumes, fruits, vegetables, nuts, and seeds eaten at every meal.

Question 27: How many calories does one gram of fat provide?

4 calories
7 calories
9 calories (Correct answer)
5 calories

Correct answer: 9 calories

Fat is the most calorie-dense macronutrient, providing 9 calories per gram.

Question 28: Which cooking technique helps reduce phytates in legumes and improve mineral absorption?

Microwaving
Freezing
Frying at high heat
Soaking and sprouting (Correct answer)

Correct answer: Soaking and sprouting

Soaking, sprouting, and fermenting legumes and grains reduces their phytate content, improving the bioavailability of minerals like iron and zinc.

Question 29: The Mediterranean diet encourages shared meals and social eating because of what broader principle?

It was originally designed for communal kitchens
Food culture and lifestyle are part of overall health (Correct answer)
It reduces portion sizes
Group eating improves digestion

Correct answer: Food culture and lifestyle are part of overall health

The Mediterranean diet emphasizes that food culture, lifestyle, social connections, and physical activity are all integral components of overall health and wellbeing.

Question 30: Which beverage is typically allowed during all phases of the South Beach Diet?

Fruit juice
Sweetened sports drinks
Regular soda
Water and unsweetened coffee or tea (Correct answer)

Correct answer: Water and unsweetened coffee or tea

Water and unsweetened beverages like coffee and tea are permitted throughout all phases, while sugary drinks are avoided.

Question 31: Which macronutrient provides 9 calories per gram, the highest of all macronutrients?

Protein
Carbohydrates
Fat (Correct answer)
Fiber

Correct answer: Fat

Dietary fat provides 9 calories per gram, compared to 4 calories per gram for both carbohydrates and protein.

Question 32: What is glycogen?

A protein used for immune function
A hormone that regulates fat metabolism
A type of dietary fat stored in adipose tissue
The stored form of carbohydrates in the liver and muscles (Correct answer)

Correct answer: The stored form of carbohydrates in the liver and muscles

Glycogen is the stored form of glucose found primarily in the liver and skeletal muscle for quick energy release.

Question 33: Which of the following best describes the Mediterranean diet's approach to sweets and desserts?

Artificial sweeteners replace all sugar
Sweets are completely banned
Sweets are consumed rarely and are naturally sweetened (e.g., fruit) (Correct answer)
Unlimited consumption of sweets

Correct answer: Sweets are consumed rarely and are naturally sweetened (e.g., fruit)

The Mediterranean diet limits sweets and desserts to occasional consumption, with fresh fruit often serving as the preferred sweet ending to a meal.

Question 34: Which vitamin is essential for calcium absorption, which supports bone health during weight-bearing exercise?

Vitamin K
Vitamin C
Vitamin D (Correct answer)
Vitamin A

Correct answer: Vitamin D

Vitamin D regulates calcium absorption in the gut, making it critical for maintaining bone density in athletes and active individuals.

Question 35: What is 'yo-yo dieting' and what is its primary concern?

A pattern of repeated weight loss and regain that may increase health risks and make future weight loss harder (Correct answer)
A diet that alternates between high and low fat foods
A diet plan that cycles through different macronutrient profiles
Eating the same foods in rotation every week

Correct answer: A pattern of repeated weight loss and regain that may increase health risks and make future weight loss harder

Yo-yo dieting (weight cycling) involves repeatedly losing and regaining weight, which may negatively affect metabolism, increase cardiovascular risk, and make sustained weight loss more difficult.

Question 36: True or false: Consuming mono- and polyunsaturated fats rather than saturated or trans fats promotes weight loss.

False (Correct answer)
True

Correct answer: False

While mono- and polyunsaturated fats are healthier for heart health than saturated or trans fats, consuming any type of fat in excess will contribute to weight gain, not weight loss. Weight loss primarily depends on a caloric deficit, meaning consuming fewer calories than expended, regardless of the fat type.

Question 37: Which vitamin is particularly important to supplement on a plant-based diet due to limited sun exposure and lack of dietary sources?

Vitamin D (Correct answer)
Vitamin E
Vitamin C
Vitamin A

Correct answer: Vitamin D

Vitamin D is limited in plant foods and many people, especially those indoors, are deficient; supplementation or fortified foods are important on a plant-based diet.

Question 38: Why does the South Beach Diet allow legumes like lentils and chickpeas during Phase 1?

They have a low glycemic index and provide fiber and plant protein (Correct answer)
They have a very high glycemic index
They are high in fat and low in carbs
They contain no carbohydrates

Correct answer: They have a low glycemic index and provide fiber and plant protein

Legumes have a low glycemic index due to their high fiber and protein content, which slows glucose absorption and makes them Phase 1 compatible.

Question 39: Which of the following is classified as a complete protein?

Chicken breast (Correct answer)
Brown rice
Black beans
Lentils

Correct answer: Chicken breast

Chicken breast is a complete protein because it contains all nine essential amino acids in adequate amounts.

Question 40: Which South Beach Diet stage is the least constricting?

First
Fourth
Second
Third (Correct answer)

Correct answer: Third

Phase Three of the South Beach Diet is the maintenance phase, where individuals have achieved their goal weight and learned sustainable eating habits. It is the least restrictive phase, allowing for a wider variety of foods while still emphasizing healthy choices for long-term weight management.

Question 41: Which macronutrient is the body's preferred primary source of energy?

Protein
Fiber
Fat
Carbohydrates (Correct answer)

Correct answer: Carbohydrates

Carbohydrates are the body's preferred and most readily used source of energy, especially for the brain and muscles.

Question 42: Which mineral is most critical for oxygen transport in the blood and directly impacts exercise endurance?

Iron (Correct answer)
Calcium
Zinc
Magnesium

Correct answer: Iron

Iron is a core component of hemoglobin, which carries oxygen from the lungs to working muscles during aerobic exercise.

Question 43: True or false: When more people join a healthy lifestyle plan, weight loss becomes more difficult.

False (Correct answer)
True

Correct answer: False

Joining a healthy lifestyle plan with more people often provides a supportive community, increased motivation, and shared accountability, which can make weight loss easier and more sustainable. Social support is a recognized factor in successful health behavior change.

Question 44: How does the South Beach Diet differ from the Atkins Diet?

South Beach focuses on carb quality and heart-healthy fats; Atkins focuses mainly on very low carb intake regardless of fat type (Correct answer)
Both diets are identical in their approach
South Beach permits unlimited saturated fat while Atkins restricts it
South Beach eliminates protein while Atkins emphasizes it

Correct answer: South Beach focuses on carb quality and heart-healthy fats; Atkins focuses mainly on very low carb intake regardless of fat type

South Beach emphasizes the quality of carbohydrates and healthy fats, whereas Atkins primarily focuses on very low carbohydrate intake without distinguishing fat types.

Question 45: How many calories does one gram of carbohydrate provide?

7 calories
4 calories (Correct answer)
2 calories
9 calories

Correct answer: 4 calories

Carbohydrates provide 4 calories per gram, the same as protein.

Question 46: Which dietary strategy is most associated with reducing delayed onset muscle soreness (DOMS)?

Restricting all food for 4 hours post-exercise
Consuming only carbohydrates after training
Adequate protein and anti-inflammatory foods like tart cherry juice (Correct answer)
High sugar intake immediately post-workout

Correct answer: Adequate protein and anti-inflammatory foods like tart cherry juice

Protein supports muscle repair and anti-inflammatory compounds in foods like tart cherry juice have been shown in studies to reduce DOMS severity.

Question 47: Which scientific term describes the shift from glucose to fat burning that occurs during fasting?

Gluconeogenesis only
Anabolic switching
Metabolic flexibility (Correct answer)
Lipid catabolism

Correct answer: Metabolic flexibility

Metabolic flexibility refers to the body's ability to switch fuel sources between glucose and fat depending on availability, which improves with regular fasting.

Question 48: Which dietary pattern best supports fat loss while preserving muscle during a calorie deficit?

Very low protein, high carbohydrate
Strict fasting with no post-workout nutrition
High protein intake combined with resistance training (Correct answer)
Low calorie with minimal protein

Correct answer: High protein intake combined with resistance training

Adequate protein intake (1.6–2.2 g/kg body weight) combined with resistance training preserves muscle mass during a caloric deficit.

Question 49: What type of fat is predominantly found in olive oil, which makes it heart-healthy?

Polyunsaturated fat
Saturated fat
Trans fat
Monounsaturated fat (Correct answer)

Correct answer: Monounsaturated fat

Olive oil is rich in monounsaturated fatty acids, particularly oleic acid, which is associated with reduced inflammation and heart disease risk.

Question 50: True/False: Time constraints and a lack of enjoyment are often the biggest obstacles to exercising.

True (Correct answer)
False

Correct answer: True

Many individuals cite busy schedules and the perception of not having enough time as major barriers to regular exercise. Additionally, if exercise is not enjoyable, it becomes difficult to sustain, leading to a lack of motivation and adherence.

Question 51: Which medical condition was the ketogenic diet originally developed to treat?

Heart disease
Obesity
Epilepsy (Correct answer)
Type 2 diabetes

Correct answer: Epilepsy

The ketogenic diet was developed in the 1920s as a treatment for epilepsy, particularly in children who didn't respond to medications.

Question 52: What is the primary structural role of protein in the body?

Regulating blood sugar
Storing energy
Absorbing fat-soluble vitamins
Building and repairing tissues (Correct answer)

Correct answer: Building and repairing tissues

Protein's primary role is to build, repair, and maintain body tissues including muscle, skin, and organs.

Question 53: What is a 'cyclical ketogenic diet' (CKD)?

A diet that rotates macronutrient ratios daily
A diet with 5 low-carb days followed by 1–2 high-carb days (Correct answer)
A diet that cycles between different calorie levels
A diet alternating between keto and Mediterranean protocols

Correct answer: A diet with 5 low-carb days followed by 1–2 high-carb days

A cyclical ketogenic diet involves 5–6 days of standard ketogenic eating followed by 1–2 higher-carb 'refeed' days to replenish glycogen.

Question 54: Which of these fruits would be most appropriate to introduce during South Beach Diet Phase 2?

Dates
Watermelon
Blueberries (Correct answer)
Canned fruit in syrup

Correct answer: Blueberries

Blueberries have a relatively low glycemic index and are rich in antioxidants, making them a suitable Phase 2 fruit choice.

Question 55: During Phase 2 of the South Beach Diet, how are carbohydrates reintroduced?

Carbs remain completely restricted
Only white bread and pasta are permitted
Gradually, starting with low-glycemic options (Correct answer)
All carbs are allowed immediately

Correct answer: Gradually, starting with low-glycemic options

Phase 2 gradually reintroduces low-glycemic carbohydrates such as whole grains, fruits, and starchy vegetables in moderate amounts.

Question 56: Which plant food is considered a complete protein (containing all essential amino acids)?

Almonds
Rice
Lentils
Quinoa (Correct answer)

Correct answer: Quinoa

Quinoa is a complete protein, meaning it contains all nine essential amino acids, making it an excellent plant-based protein source.

Question 57: Which type of fat is found in avocados and olive oil and is considered heart-healthy?

Saturated fat
Partially hydrogenated fat
Trans fat
Monounsaturated fat (Correct answer)

Correct answer: Monounsaturated fat

Monounsaturated fats, found in avocados and olive oil, support heart health by improving cholesterol levels.

Question 58: What percentage of total daily calories is generally recommended to come from protein for a healthy adult?

20–40%
10–35% (Correct answer)
5–10%
45–65%

Correct answer: 10–35%

The Acceptable Macronutrient Distribution Range (AMDR) for protein is 10–35% of total daily calories.

Question 59: What does BMR (Basal Metabolic Rate) represent?

Maximum calorie intake for weight loss
Calories needed to maintain weight with a sedentary lifestyle
Calories burned during exercise
Calories the body burns at rest to maintain basic physiological functions (Correct answer)

Correct answer: Calories the body burns at rest to maintain basic physiological functions

BMR is the number of calories the body needs to sustain basic functions (breathing, circulation, cell repair) at complete rest.

Question 60: What is the approximate caloric split (carbs/fat/protein) suggested by the USDA Dietary Guidelines for a balanced diet?

60/20/20
50/40/10
30/50/20
45–65% / 20–35% / 10–35% (Correct answer)

Correct answer: 45–65% / 20–35% / 10–35%

The USDA Dietary Guidelines align with AMDR ranges: 45–65% carbohydrates, 20–35% fat, and 10–35% protein.

Question 61: Which of the following is an example of a whole grain food?

White rice
Cornstarch
Oatmeal (Correct answer)
Enriched white bread

Correct answer: Oatmeal

Oatmeal is made from whole oats and retains the bran, germ, and endosperm, making it a true whole grain food.

Question 62: What is the concept of 'protein complementarity' in plant-based nutrition?

Combining different plant proteins to ensure all essential amino acids are obtained (Correct answer)
Avoiding plant proteins that compete with absorption
Eating protein supplements alongside plant foods
Eating complete proteins at every meal separately

Correct answer: Combining different plant proteins to ensure all essential amino acids are obtained

Protein complementarity involves combining plant protein sources (like rice and beans) to provide all essential amino acids, though this doesn't need to happen at every single meal.

Question 63: True or false: You shouldn't eat fish more than once a month.

False (Correct answer)
True

Correct answer: False

Dietary guidelines from health organizations widely recommend eating fish, especially fatty fish rich in omega-3 fatty acids, at least two times per week for its heart-healthy benefits. Limiting fish consumption to once a month would mean missing out on these important nutritional advantages.

Question 64: Which fat type is considered the most harmful to cardiovascular health and is largely artificial?

Omega-3 fatty acid
Monounsaturated fat
Trans fat (Correct answer)
Polyunsaturated fat

Correct answer: Trans fat

Trans fats, especially industrial partially hydrogenated oils, raise LDL cholesterol and lower HDL, significantly increasing heart disease risk.

Question 65: Resistance training primarily increases resting metabolic rate by doing what?

Elevating cortisol levels chronically
Building lean muscle mass that burns more calories at rest (Correct answer)
Increasing body temperature permanently
Reducing appetite hormones

Correct answer: Building lean muscle mass that burns more calories at rest

Muscle tissue is metabolically active and burns more calories at rest than fat tissue, so increasing muscle mass raises the basal metabolic rate.

Question 66: What environmental benefit is most associated with plant-based diets?

Lower greenhouse gas emissions and reduced land use compared to animal-based diets (Correct answer)
Increased soil fertility from plant waste
Elimination of pesticide use
Reduced water usage only

Correct answer: Lower greenhouse gas emissions and reduced land use compared to animal-based diets

Plant-based diets produce significantly lower greenhouse gas emissions and require less land and water compared to animal-based diets, making them more environmentally sustainable.

Question 67: Legumes are an important protein source in the Mediterranean diet. Which of the following is a legume?

Almonds
Feta cheese
Quinoa
Lentils (Correct answer)

Correct answer: Lentils

Lentils are legumes and are a key plant-based protein and fiber source in the Mediterranean diet.

Question 68: What is the function of antioxidants in the diet?

Provide quick energy
Regulate blood sugar
Neutralize harmful free radicals (Correct answer)
Build muscle fibers

Correct answer: Neutralize harmful free radicals

Antioxidants neutralize free radicals, reducing oxidative stress that can damage cells and contribute to chronic disease.

Question 69: Which of the following snacks best fits South Beach Diet Phase 1 guidelines?

Celery with almond butter (Correct answer)
Crackers and cheese spread
A handful of pretzels
A banana with honey

Correct answer: Celery with almond butter

Celery (non-starchy vegetable) with almond butter (healthy fats and protein) is ideal for Phase 1, avoiding refined carbs and sugar.

Question 70: What are essential amino acids?

Amino acids the body can produce on its own
Amino acids that must be obtained through diet (Correct answer)
Amino acids found only in plant foods
Amino acids used solely for energy production

Correct answer: Amino acids that must be obtained through diet

Essential amino acids cannot be synthesized by the body and must be consumed through food.

Question 71: A well-planned plant-based diet can be nutritionally complete for which life stages?

Only for people under 50 without health conditions
Adults only
Adults and elderly only
All life stages including infancy, childhood, pregnancy, and older adulthood (Correct answer)

Correct answer: All life stages including infancy, childhood, pregnancy, and older adulthood

Major dietetic associations, including the Academy of Nutrition and Dietetics, state that well-planned plant-based diets are nutritionally adequate for all stages of life.

Question 72: On the South Beach Diet, how is portion control typically handled?

Portions are determined by a daily point system
You can eat unlimited amounts of all approved foods
Portions are controlled by focusing on hunger cues and approved food categories rather than strict calorie limits (Correct answer)
Precise calorie counting of every meal is required

Correct answer: Portions are controlled by focusing on hunger cues and approved food categories rather than strict calorie limits

Rather than strict calorie counting, the South Beach Diet guides portion control through food quality choices and eating until satisfied — not stuffed.

Question 73: What metabolic state does the ketogenic diet aim to achieve?

Gluconeogenesis
Ketosis (Correct answer)
Glycolysis
Lipolysis

Correct answer: Ketosis

The ketogenic diet aims to achieve ketosis, a metabolic state where the body burns fat for fuel instead of glucose.

Question 74: Which macronutrient is most critical for preserving lean muscle mass during a calorie-deficit diet?

Fat
Fiber
Carbohydrates
Protein (Correct answer)

Correct answer: Protein

Adequate protein intake during caloric restriction provides amino acids that help spare muscle tissue from being broken down for energy.

Question 75: Which nut is most commonly associated with the Mediterranean diet?

Peanuts
Pecans
Cashews
Almonds and walnuts (Correct answer)

Correct answer: Almonds and walnuts

Almonds and walnuts are among the most commonly consumed nuts in the Mediterranean diet and are eaten as snacks or added to meals.

Question 76: Which condition describes the triad of disordered eating, amenorrhea, and low bone density commonly seen in female athletes?

Anemia trifecta
Metabolic syndrome
Female Athlete Triad (Correct answer)
Overtraining syndrome

Correct answer: Female Athlete Triad

The Female Athlete Triad links low energy availability (often from disordered eating) to hormonal disruption causing loss of menstrual function and reduced bone density.

Question 77: What is the primary goal of Phase 3 of the South Beach Diet?

Begin a strict calorie-counting regimen
Return to eating high-glycemic foods freely
Maintain the healthy eating habits developed in Phases 1 and 2 as a lifelong lifestyle (Correct answer)
Eliminate all carbohydrates permanently

Correct answer: Maintain the healthy eating habits developed in Phases 1 and 2 as a lifelong lifestyle

Phase 3 is a maintenance phase designed to sustain the healthy eating patterns established earlier as a permanent lifestyle, not a temporary diet.

Question 78: Which type of fish is most strongly emphasized in the Mediterranean diet?

Fatty fish like salmon and sardines (Correct answer)
Tilapia
Shellfish only
Catfish

Correct answer: Fatty fish like salmon and sardines

Fatty fish rich in omega-3 fatty acids, such as salmon, sardines, and mackerel, are emphasized at least twice per week in the Mediterranean diet.

Question 79: What is the most common intermittent fasting protocol?

5:2 method
24-hour fast
Alternate day fasting
16:8 method (Correct answer)

Correct answer: 16:8 method

The 16:8 method — fasting for 16 hours and eating within an 8-hour window — is the most popular and widely practiced intermittent fasting protocol.

Question 80: The Mediterranean diet is recognized by UNESCO as what?

A World Heritage dietary pattern
An Intangible Cultural Heritage (Correct answer)
A global health standard
A protected agricultural designation

Correct answer: An Intangible Cultural Heritage

UNESCO inscribed the Mediterranean diet as an Intangible Cultural Heritage of Humanity in 2013, recognizing its cultural and health significance.

Question 81: What macronutrient ratio is typical for a standard ketogenic diet?

70% fat, 25% protein, 5% carbs (Correct answer)
60% fat, 20% protein, 20% carbs
40% fat, 40% protein, 20% carbs
50% fat, 30% protein, 20% carbs

Correct answer: 70% fat, 25% protein, 5% carbs

A standard ketogenic diet typically consists of 70% fat, 25% protein, and only 5% carbohydrates to induce ketosis.

Question 82: Which plant-based food is an excellent source of omega-3 fatty acids?

White rice
Iceberg lettuce
White potatoes
Flaxseeds (Correct answer)

Correct answer: Flaxseeds

Flaxseeds are rich in ALA (alpha-linolenic acid), an omega-3 fatty acid, and are one of the best plant-based sources of this essential fat.

Question 83: What is the primary fuel source for the brain on a well-established ketogenic diet?

Protein
Glucose
Ketone bodies (Correct answer)
Glycogen

Correct answer: Ketone bodies

After adaptation, the brain can meet up to 70% of its energy needs from ketone bodies instead of glucose.

Question 84: How does intermittent fasting affect growth hormone (HGH) levels?

HGH increases significantly during fasting (Correct answer)
HGH levels are unaffected by fasting
HGH decreases during fasting
HGH is converted to insulin during fasting

Correct answer: HGH increases significantly during fasting

Fasting has been shown to significantly increase growth hormone levels, which supports fat burning and muscle preservation.

Question 85: What are ketone bodies primarily produced from on a ketogenic diet?

Amino acids
Fatty acids (Correct answer)
Protein
Glucose

Correct answer: Fatty acids

Ketone bodies are produced in the liver primarily from fatty acids when carbohydrate intake is very low.

Question 86: Which blood marker is often tested to confirm the body is in nutritional ketosis?

Beta-hydroxybutyrate (Correct answer)
LDL cholesterol
Hemoglobin A1c
C-reactive protein

Correct answer: Beta-hydroxybutyrate

Beta-hydroxybutyrate (BHB) is the primary ketone body in the blood and is measured to confirm nutritional ketosis, typically above 0.5 mmol/L.

Question 87: Dairy consumption in the Mediterranean diet is mainly in what form?

Ice cream and cream
Whole milk and butter
Yogurt and cheese (Correct answer)
Low-fat milk only

Correct answer: Yogurt and cheese

Dairy in the Mediterranean diet is primarily consumed as yogurt (especially Greek yogurt) and cheese in moderate amounts.

Question 88: Which of the following is a primary function of dietary fiber, technically a type of carbohydrate?

Promoting digestive health and satiety (Correct answer)
Providing rapid energy
Building muscle protein
Synthesizing sex hormones

Correct answer: Promoting digestive health and satiety

Dietary fiber supports digestive health, feeds beneficial gut bacteria, and increases satiety without adding significant calories.

Question 89: What is 'alternate day fasting' (ADF)?

Alternating between low-calorie and normal eating days (Correct answer)
Fasting for 36 hours, eating for 12
Eating only alternating meals throughout the day
Fasting every other day completely

Correct answer: Alternating between low-calorie and normal eating days

Alternate day fasting alternates between normal eating days and modified fast days where calorie intake is reduced to about 25% of normal needs.

Question 90: Which vitamin requires fat to be properly absorbed in the body?

Vitamin B12
Vitamin D (Correct answer)
Vitamin C
Vitamin B6

Correct answer: Vitamin D

Vitamin D is fat-soluble and requires dietary fat for proper absorption in the digestive tract.

Question 91: What is the recommended Acceptable Macronutrient Distribution Range (AMDR) for total fat intake?

5–15%
20–35% (Correct answer)
35–50%
10–20%

Correct answer: 20–35%

The AMDR for fat is 20–35% of total daily calories for adults, supporting vital functions without excess.

Question 92: What is a 'calorie deficit' and why is it central to weight loss?

Consuming fewer calories than the body expends, causing the body to use stored energy (Correct answer)
Eating zero calories for extended periods
Burning more calories than one eats in a single day only
Eating only negative-calorie foods

Correct answer: Consuming fewer calories than the body expends, causing the body to use stored energy

A calorie deficit occurs when calorie intake is less than total energy expenditure, forcing the body to use stored fat as fuel, which results in weight loss.

Question 93: In the South Beach Diet, what does the Glycemic Index (GI) measure?

How quickly a food raises blood glucose levels (Correct answer)
Total calories in a food
The amount of fat in a food
How much protein a food contains

Correct answer: How quickly a food raises blood glucose levels

The Glycemic Index ranks foods by how rapidly they raise blood glucose, with high-GI foods causing quicker spikes.

Question 94: How long should someone adhere to Phase One of the South Beach Diet?

One Week
Two Weeks (Correct answer)
Four Weeks
Three Weeks

Correct answer: Two Weeks

Phase One of the South Beach Diet is the most restrictive phase, designed to eliminate cravings and jumpstart weight loss. It typically lasts for two weeks, after which individuals transition to Phase Two.

Question 95: What does 'sustainable weight loss' typically involve according to health guidelines in the US?

Losing 5+ pounds per week through very low calorie diets
Losing 1–2 pounds per week through moderate lifestyle changes (Correct answer)
Losing as much weight as possible as fast as possible
Rapid initial weight loss followed by maintenance

Correct answer: Losing 1–2 pounds per week through moderate lifestyle changes

US health guidelines (CDC, NHLBI) recommend losing 1–2 pounds per week through moderate calorie reduction and increased physical activity as the safest, most sustainable approach.

Question 96: What is the 'Warrior Diet' in the context of intermittent fasting?

Fasting all day and eating one large meal at night within a 4-hour window (Correct answer)
High-protein eating every 2 hours
Eating raw foods only during a 4-hour window at night
Fasting 3 days per week with large meals on other days

Correct answer: Fasting all day and eating one large meal at night within a 4-hour window

The Warrior Diet involves eating small amounts of raw fruits and vegetables during the day and consuming one large meal at night within a 4-hour eating window.

Question 97: How many grams of protein per kilogram of body weight is generally recommended for a sedentary adult?

2.2 g/kg
0.4 g/kg
1.6 g/kg
0.8 g/kg (Correct answer)

Correct answer: 0.8 g/kg

The RDA for protein is 0.8 grams per kilogram of body weight per day for sedentary adults.

Question 98: When someone lacks a certain nutrient, it signifies

They are not getting their 5 a day
They are not eating enough nutrient, and it is giving them symptoms. (Correct answer)
They do not like nuts
They do not eat enough vitamins

Correct answer: They are not eating enough nutrient, and it is giving them symptoms.

When someone lacks a certain nutrient, it means their body is not receiving or absorbing enough of that specific nutrient, which can disrupt normal physiological processes. This deficiency can lead to a range of specific symptoms or health problems, as the body struggles to perform its functions without the necessary building blocks. Identifying these symptoms is key to addressing the deficiency.

Question 99: Which of the following is a high-fat, keto-friendly food?

Oatmeal
Brown rice
Sweet potato
Olive oil (Correct answer)

Correct answer: Olive oil

Olive oil is nearly 100% fat with zero carbohydrates, making it an ideal staple for a ketogenic diet.

Question 100: What happens to insulin levels on a ketogenic diet?

They increase significantly
They remain unchanged
They decrease significantly (Correct answer)
They fluctuate randomly

Correct answer: They decrease significantly

Low carbohydrate intake on a ketogenic diet leads to significantly reduced insulin secretion, which promotes fat burning.

Question 101: The Physicians Committee for Responsible Medicine (PCRM) recommends a plant-based diet for what primary health benefit?

Improving eyesight
Building maximum muscle mass
Reducing the risk of heart disease, cancer, and type 2 diabetes (Correct answer)
Increased athletic performance only

Correct answer: Reducing the risk of heart disease, cancer, and type 2 diabetes

PCRM advocates plant-based diets primarily for their well-documented ability to reduce risks of heart disease, certain cancers, and type 2 diabetes.

Question 102: Which hormone's sensitivity improves with intermittent fasting?

Cortisol
Thyroid hormone
Testosterone
Insulin (Correct answer)

Correct answer: Insulin

Intermittent fasting improves insulin sensitivity, helping the body manage blood sugar more effectively and reducing the risk of type 2 diabetes.

Question 103: Which electrolyte is most commonly lost and must be supplemented on a ketogenic diet?

Calcium
Sodium (Correct answer)
Iron
Zinc

Correct answer: Sodium

Sodium is rapidly lost through increased urination as insulin levels drop on a ketogenic diet, making supplementation essential.

Question 104: Why are refined grains like white bread restricted on the South Beach Diet?

They are high in healthy fats
They contain too much protein
They have a high glycemic index and cause rapid blood sugar spikes (Correct answer)
They provide too many vitamins

Correct answer: They have a high glycemic index and cause rapid blood sugar spikes

Refined grains have a high glycemic index because the milling process strips away fiber, causing blood sugar to rise quickly.

Question 105: What role do B vitamins play in exercise performance?

They increase testosterone production
They directly build muscle tissue
They primarily reduce inflammation post-exercise
They serve as coenzymes in energy metabolism, helping convert food into usable ATP (Correct answer)

Correct answer: They serve as coenzymes in energy metabolism, helping convert food into usable ATP

B vitamins such as B1, B2, B3, B6, and B12 are essential cofactors in metabolic pathways that produce ATP from carbohydrates, fats, and protein.

Question 106: True or false: All meals with the claim "trans fat free" are beneficial for heart health

False (Correct answer)
True

Correct answer: False

A 'trans fat free' claim only indicates the absence of trans fats, which are harmful, but it doesn't guarantee overall heart health benefits. The meal could still be high in saturated fat, sodium, sugar, or total calories, all of which can negatively impact heart health. A holistic nutritional assessment is necessary.

Question 107: What iodine concern exists for people following a strict plant-based diet?

Iodine is irrelevant for plant-based dieters
Most plant foods are low in iodine unless iodized salt or sea vegetables are included (Correct answer)
Plants contain too much iodine, causing thyroid problems
Plants block iodine absorption completely

Correct answer: Most plant foods are low in iodine unless iodized salt or sea vegetables are included

Most plant foods are naturally low in iodine, so plant-based eaters should use iodized salt, eat sea vegetables, or take an iodine supplement to meet needs.

Question 108: Malnourishment entails

Someone is eating too much
Someone is starved
A person is not eating properly
May mean undernutrition or overnutrition (Correct answer)

Correct answer: May mean undernutrition or overnutrition

Malnourishment is a broad term that encompasses both undernutrition and overnutrition. Undernutrition occurs when a person does not consume enough essential nutrients, leading to deficiencies. Overnutrition, conversely, involves consuming an excess of nutrients, often resulting in obesity and related health problems. Both conditions negatively impact health and proper bodily function.

Question 109: If someone has successfully completed Phase 1 and Phase 2 but regains weight, what does the South Beach Diet recommend?

Permanently stay on Phase 1 restrictions
Switch entirely to a different diet plan
Increase calorie intake to reset metabolism
Return briefly to Phase 1 to reset and then progress through the phases again (Correct answer)

Correct answer: Return briefly to Phase 1 to reset and then progress through the phases again

The South Beach Diet recommends temporarily returning to the stricter Phase 1 to regain control of cravings and blood sugar, then moving forward through the phases again.

Question 110: Which of the following beverages adds significant empty calories and can hinder weight loss?

Unsweetened green tea
Plain sparkling water
Sugar-sweetened beverages (sodas, juices) (Correct answer)
Black coffee

Correct answer: Sugar-sweetened beverages (sodas, juices)

Sugar-sweetened beverages add substantial calories without promoting satiety, making them a leading contributor to excess calorie intake and weight gain.

Question 111: What is 'carbohydrate periodization' in an athletic diet?

Avoiding carbs entirely on rest days
Eating the same amount of carbs every day
Consuming only complex carbs during competition
Rotating carbohydrate intake based on training intensity and volume (Correct answer)

Correct answer: Rotating carbohydrate intake based on training intensity and volume

Carbohydrate periodization means strategically adjusting carb intake to match training demands — more on hard days, less on easy or rest days.

Question 112: What term describes the daily minimum amount of a nutrient needed to prevent deficiency in healthy individuals?

Recommended Dietary Allowance (RDA) (Correct answer)
Estimated Average Requirement (EAR)
Adequate Intake (AI)
Tolerable Upper Intake Level (UL)

Correct answer: Recommended Dietary Allowance (RDA)

The RDA is the daily intake level sufficient to meet the needs of nearly all healthy individuals in a specific group.

Question 113: Which beverage is consumed in moderation and considered part of the traditional Mediterranean diet?

Beer
Red wine (Correct answer)
Spirits
Soda

Correct answer: Red wine

Red wine is traditionally consumed in moderation (one glass per day for women, up to two for men) with meals as part of the Mediterranean lifestyle.

Question 114: What side effect is commonly reported when beginning intermittent fasting?

Hunger and irritability during the initial adaptation period (Correct answer)
Increased energy immediately
Rapid muscle gain
Improved sleep from day one

Correct answer: Hunger and irritability during the initial adaptation period

Hunger and irritability ('hanger') are common during the first 1–2 weeks of intermittent fasting as the body adapts to new eating patterns.

Question 115: How often does the Mediterranean diet recommend eating red meat?

Never
Several times per week
Daily
Rarely or a few times per month (Correct answer)

Correct answer: Rarely or a few times per month

The Mediterranean diet recommends limiting red meat to a few times per month, emphasizing fish, poultry, and plant proteins instead.

Question 116: What is 'heme iron' vs 'non-heme iron' relevant to plant-based diets?

Non-heme iron is from plants and is less readily absorbed than heme iron from animals (Correct answer)
Both types are equally absorbed regardless of source
Heme iron is from plants and is better absorbed; non-heme iron is from animals
Heme iron causes anemia; non-heme iron does not

Correct answer: Non-heme iron is from plants and is less readily absorbed than heme iron from animals

Non-heme iron from plant foods is less bioavailable than heme iron from animal foods; pairing plant iron with vitamin C can significantly improve absorption.

Question 117: Which dietary strategy helps reduce hunger while maintaining a calorie deficit for weight loss?

High-volume, low-calorie foods (e.g., vegetables, lean protein) (Correct answer)
Eating only liquid meals
Avoiding all carbohydrates
Eating one large meal per day

Correct answer: High-volume, low-calorie foods (e.g., vegetables, lean protein)

Eating high-volume, low-calorie foods like vegetables and lean protein helps fill the stomach and signal satiety while keeping total calorie intake low.

Question 118: The Mediterranean diet has been shown to reduce the risk of which condition?

Hypothyroidism
Cardiovascular disease (Correct answer)
Osteoporosis
Hypoglycemia

Correct answer: Cardiovascular disease

Numerous large studies, including the PREDIMED trial, have shown the Mediterranean diet significantly reduces the risk of cardiovascular disease.

Question 119: What is the glycemic index (GI) used to measure?

The amount of sugar in a food
How quickly a food raises blood sugar levels (Correct answer)
Total calorie content of a food
Fat content relative to carbohydrates

Correct answer: How quickly a food raises blood sugar levels

The glycemic index ranks foods on a scale of 0-100 based on how quickly they raise blood glucose levels after eating.

Question 120: Which zinc-rich plant food is commonly recommended for plant-based eaters?

Pumpkin seeds (Correct answer)
Romaine lettuce
Tomatoes
White bread

Correct answer: Pumpkin seeds

Pumpkin seeds are among the richest plant-based sources of zinc, an essential mineral less bioavailable from plant foods than from animal products.

Question 121: What percentage of total daily calories should come from protein according to general US dietary guidelines?

50-65%
40-50%
5-10%
10-35% (Correct answer)

Correct answer: 10-35%

The Acceptable Macronutrient Distribution Range (AMDR) for protein is 10-35% of total daily caloric intake.

Question 122: Who was the South Beach Diet's creator?

Dr. Beach
Dr. Agatston (Correct answer)
Dr. Russo
Dr. Angelo

Correct answer: Dr. Agatston

The South Beach Diet was created by Dr. Arthur Agatston, a cardiologist, who developed it to help his patients lose weight and improve their heart health by focusing on lean protein, healthy fats, and good carbohydrates.

Question 123: The MyPlate model recommends that grains make up what fraction of your plate?

One third
One quarter (Correct answer)
Two thirds
One half

Correct answer: One quarter

MyPlate recommends grains fill one quarter of the plate, with at least half of those being whole grains.

Question 124: True/False: Adding physical activity to your regular routine is a surefire method to lower your risk of heart disease.

False
True (Correct answer)

Correct answer: True

Regular physical activity significantly strengthens the heart, improves blood circulation, lowers blood pressure and cholesterol levels, and helps maintain a healthy weight. These combined effects are well-documented to substantially reduce the risk of developing heart disease.

Question 125: Relative Energy Deficiency in Sport (RED-S) is most commonly triggered by which scenario?

Chronic low energy availability relative to training demands (Correct answer)
Overhydration during competition
Taking creatine supplements
Eating too much protein

Correct answer: Chronic low energy availability relative to training demands

RED-S occurs when athletes do not consume enough calories to support both exercise and normal physiological functions, affecting hormones, bone, and immunity.

Registration Examination for Dietitians (RD/RDN Exam)

The CDR Registration Examination for Dietitians assesses entry-level competency in nutrition care, dietetics principles, food and nutrition science, and management of food systems to credential Registered Dietitian Nutritionists.

125

Questions

180 min

Time Limit

70%

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